If the tractor has been sitting for any length of time, the gas in the carb has turned to varnish and cause the needle valve to become sticky. Tapping on the carb will loosen it up a bit, but only temporarily. It is also quite possible that the hinge pin for the float has become sticky and the float cannot drop as needed. Probably your best option at this time to get a can of aerosol carb cleaner, take the carb apart and clean the needle valve and seat, as well as the float and the hinge pin. Probably will not need a complete rebuild, but you probably will need a new gasket for in between the top and bottom carb halves.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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